Hectopascals to centimeters of water converter above calculates how many centimeters of water are in 'X' hectopascals (where 'X' is the number of hectopascals to convert to centimeters of water). In order to convert a value from hectopascals to centimeters of water (from hPa to cmH2O) just type the number of hPa to be converted to cmH2O and then click on the 'convert' button.